import type { Uint8Array_ } from "./_types.ts";
export type { Uint8Array_ };
/**
 * Converts data into a base64-encoded string.
 *
 * @see {@link https://www.rfc-editor.org/rfc/rfc4648.html#section-4}
 *
 * @param data The data to encode.
 * @returns The base64-encoded string.
 *
 * @example Usage
 * ```ts
 * import { encodeBase64 } from "base64.ts";
 * import { assertEquals } from "../assert/mod.ts";
 *
 * assertEquals(encodeBase64("foobar"), "Zm9vYmFy");
 * ```
 */
export declare function encodeBase64(
  data: ArrayBuffer | Uint8Array | string,
): string;
/**
 * Decodes a base64-encoded string.
 *
 * @see {@link https://www.rfc-editor.org/rfc/rfc4648.html#section-4}
 *
 * @param b64 The base64-encoded string to decode.
 * @returns The decoded data.
 *
 * @example Usage
 * ```ts
 * import { decodeBase64 } from "base64.ts";
 * import { assertEquals } from "../assert/mod.ts";
 *
 * assertEquals(
 *   decodeBase64("Zm9vYmFy"),
 *   new TextEncoder().encode("foobar")
 * );
 * ```
 */
export declare function decodeBase64(b64: string): Uint8Array_;